My wife and I stayed in the apartment, top-left in the picture. The welcome was warm and the apartment was very clean and spacious, with comfortable furnishings. The rear, bedroom, window looks directly onto the vineyard and the front, balcony, window looks over the street and some houses and over a valley (NOT the Moseltal).
All three apartments are accessed by the set of steps shown bottom-right in the photograph, with the upper two accessed by an internal half-spiral. Consider this if, like us, you're travelling with a lot of luggage. The outside steps are very dark at night.
The village of Osann-Monzel is very quiet, being set back some kilometers from the main Mosel valley, and has no night-life in the form of bars or restaurants. There is one small shop, with Berkastel-Kues being the closest supermarket.